326 documents found, page 1 of 33
Occurrence of micropollutants in surface water and removal by catalytic wet per...
Silva, Adriano S.; Zadra Filho, Paulo Cesar; Ferreira, Ana Paula; Roman, Fernanda; Baldo, Arthur Pietrobon; Rauhauser, MadeleineMonitoring campaigns of contaminants of emerging concern (CECs) in surface waters is of utmost importance in evaluating the anthropogenic impact on riparian ecosystems. Beyond identifying pollutants and threats, treatment solutions are also needed to mitigate the adverse effects caused by polluted water discharged into the environment. For years, grab samples have been used to assess water quality, but the resu...
Plastic waste-derived carbon nanotubes: Influence of growth catalyst and cataly...
Roman, Fernanda; Silva, Adriano S.; Díaz de Tuesta, Jose Luis; Baldo, Arthur Pietrobon; Lopes, Jéssica Paula Marim; Gonçalves, Giane; Pereira, Ana I.Low-density polyethylene (LDPE) was used in this work to grow carbon nanotubes (CNTs) by chemical vapor deposition (CVD) over catalysts based on Ni, Fe and Al, synthesized either by co-precipitation (C) or wet impregnation (I) methods, with CNT yields in the range of 16–33 %. The morphology of the CNTs was directly influenced by the route used for the CVD catalyst synthesis, with co-precipitation-derived CVD ca...
Response surface method-driven design of experiments for the synthesis of fly a...
Silva, Ana P. F.; Natal, Ana Paula Silva; Baldo, Arthur Pietrobon; Silva, Adriano S.; Díaz de Tuesta, Jose Luis; Marin, Pricila; Peres, José A.The growing need for sustainable wastewater treatment solutions has led to exploring alternative materials to explore large-scale and reliable technologies. This study focuses on optimizing the synthesis of geopolymers based on fly ash using a Box-Behnken experimental design to enhance their adsorption efficiency for phenolic compounds, as gallic acid model pollutant which are widely found in wastewater leachin...
Selective biphasic oxidation of nitrogenated contaminants with H2O2 using polyo...
Roman, Fernanda; Piccinin, Larissa; Silva, Adriano S.; Díaz de Tuesta, Jose Luis; Vieira, Admilson L.; Silva, Adrián; Faria, Joaquim; Gomes, HelderLiquid/liquid biphasic oxidations are extensively employed in the chemical industry to manufacture a variety of chemicals and for environmental issues, such as the oxidative denitrogenated (ODN) and desulfurization of fuels. The ubiquitous presence of nitrogenated and sulfonated compounds in petroleum-derived fuels is associated with environmental and health issues, driving legislation to become stricter regard...
Biochars Derived from Olive Mill Byproducts: Typology, Characterization, and Ec...
Lustosa Filho, José Ferreira; Silva, Ana Paula Ferreira da; Costa, Silvana Teixeira; Gomes, Helder; Figueiredo, Tomás de; Hernandez Hernandez, ZulimarIn the context of climate change and the circular economy, biochar agricultural and envi- ronmental applications have attracted a good deal of attention. Biochar has unique characteristics like surface area, porosity, water-holding capacity, pH, surface charge, and nutrients. This study reviews the biochar production from olive pomace (OP) and olive stone (OS) byproducts, its chemical and physical characterizat...
New magnetic clays MnFe2O4/Shymkent for removal of heavy metals from wastewater
Baimuratova, Zhaina; Ermekov, Sayat; Silva, Adriano S.; Gomes, Helder; Kalmakhanova, MarzhanThis paper reports the development of a new method. Production of modified clay with magnetic properties based on natural clay from the Shymkent deposit (MnFe2O4/Shymkent nanocomposite), determination of its chemical composition and structure, as well as the study of basic physicochemical properties. The resulting magnetic nanocomposite was then used as an adsorbent to remove nickel (II) ions from wastewater. T...
Preface to the special issue “Commemorative contributions for the 30 years of t...
Calvete, Mário J.F.; Gomes, Helder; Gomes, José R.B.; Simões, Mário M.Q.More than thirty years have passed since the beginning of the Division of Catalysis of the Portuguese Chemical Society (SPQ), in 2001 expanded to Division of Catalysis and Porous Materials, in order to reflect the application of porous materials in non-catalytic processes, such as adsorption. We are commemorating this milestone in the Chemistry field in Portugal and, to honor the History behind its creation, co...
Time-Dependency of Guided Local Search to Solve the Capacitated Vehicle Routing...
Silva, Adriano S.; Lima, José; Silva, Adrián; Gomes, Helder; Pereira, Ana I.Research have been driven by the increased demand for delivery and pick-up services to develop new formulations and algorithms for solving Vehicle Routing Problems (VRP). The main objective is to create algorithms that can identify paths considering execution time in real-world scenarios. This study focused on using the Guided Local Search (GLS) metaheuristic available in OR-Tools to solve the Capacitated Vehic...
Beyond batch experiments: unveiling the potential of bimetallic carbon xerogels...
Silva, Adriano S.; Roman, Fernanda; Ribeiro, Rui; Garcia, Juan; Gomes, HelderSingle- and bimetallic carbon xerogels were prepared by incorporating iron and iron-cobalt precursors during their synthesis, respectively, and tested in the catalytic wet peroxide oxidation (CWPO) of ibuprofen spiked into a simulated matrix in batch mode. The bimetallic catalyst outperformed single and non-metallic catalyst by 25 and 85% after 360 min of reaction, at mild temperature (30 °C). The best-performi...
3D printed photopolymer derived carbon catalysts for enhanced wet peroxide oxid...
Silva, Adriano S.; Díaz de Tuesta, Jose Luis; Henrique, Adriano; Roman, Fernanda; Omralinov, Daria; Steldinger, Hendryk; Gläsel, JanIn this paper, we explore the application of powdered carbon and 3D-printed carbon monoliths prepared by carbonization of a tailored photopolymer. We demonstrate the efficiency of the developed carbonaceous samples in removing paracetamol (PCM) and sulfamethoxazole (SMX), used as model contaminants. Our results demonstrate that carbon samples are active in CWPO, and their catalytic activity is significantly imp...